New Functional Polymers Using Host–Guest Chemistry

Sakai, Ryosuke; Kakuchi, Toyoji

doi:10.1002/9783527655427.ch9

Cited by 1 publication

(2 citation statements)

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“…Indeed, the potential applications of host–guest chemistry are far beyond the above-mentioned aspects, and further exploration is only limited by our imagination. For instance, applications in wastewater purification, helicity induction and inversion, and fabrication of functional polyrotaxanes have been already demonstrated. Generally, this research field can be further broadened and exploited as described below.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, supramolecular chemistry, coined as “chemistry beyond the molecule”, features weak and reversible noncovalent interactions. Since its discovery, it has emerged as a powerful and versatile tool for the fabrication of novel types of responsive materials. − Supramolecular ensembles are built through noncovalent interactions such as hydrogen bonding, metal coordination, hydrophobic association, van der Waals forces, and π–π stacking. − In addition, host–guest recognition refers to the formation of supramolecular inclusion complexes consisting of two or more entities connected together via noncovalent interactions in a highly controlled and cooperative manner. , Due to the dynamic, reversible, and adaptive nature, host–guest recognition has opened up a new platform for the construction of stimuli-responsive materials, especially when integrated with conventional responsive polymer building blocks.…”

Section: Introductionmentioning

confidence: 99%

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Engineering Responsive Polymer Building Blocks with Host–Guest Molecular Recognition for Functional Applications

2014

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CONSPECTUS: All living organisms and soft matter are intrinsically responsive and adaptive to external stimuli. Inspired by this fact, tremendous effort aiming to emulate subtle responsive features exhibited by nature has spurred the invention of a diverse range of responsive polymeric materials. Conventional stimuli-responsive polymers are constructed via covalent bonds and can undergo reversible or irreversible changes in chemical structures, physicochemical properties, or both in response to a variety of external stimuli. They have been imparted with a variety of emerging applications including drug and gene delivery, optical sensing and imaging, diagnostics and therapies, smart coatings and textiles, and tissue engineering. On the other hand, in comparison with molecular chemistry held by covalent bonds, supramolecular chemistry built on weak and reversible noncovalent interactions has emerged as a powerful and versatile strategy for materials fabrication due to its facile accessibility, extraordinary reversibility and adaptivity, and potent applications in diverse fields. Typically involving more than one type of noncovalent interactions (e.g., hydrogen bonding, metal coordination, hydrophobic association, electrostatic interactions, van der Waals forces, and π-π stacking), host-guest recognition refers to the formation of supramolecular inclusion complexes between two or more entities connected together in a highly controlled and cooperative manner. The inherently reversible and adaptive nature of host-guest molecular recognition chemistry, stemming from multiple noncovalent interactions, has opened up a new platform to construct novel types of stimuli-responsive materials. The introduction of host-guest chemistry not only enriches the realm of responsive materials but also confers them with promising new applications. Most intriguingly, the integration of responsive polymer building blocks with host-guest recognition motifs will endow the former with further broadened responsiveness to external stimuli and accordingly more sophisticated functions. In this Account, we summarize recent progress in the field of responsive polymeric materials containing host-guest recognition motifs with selected examples and highlight their versatile functional applications, whereas small molecule-oriented host-guest supramolecular systems are excluded. We demonstrate how the introduction of host-guest chemistry into conventional polymer systems can modulate their responsive modes to external stimuli. Moreover, the responsive specificity and selectivity of polymeric systems can also be inherited from the host-guest recognition motifs, and these features provide extra advantages in terms of function integration. The following discussions are categorized in terms of design and functions, namely, host-guest chemistry toward the fabrication of responsive polymers and assemblies, optical sensing and imaging, drug and gene delivery, and self-healing materials. A concluding remark on future developments is also presented. We wish th...

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Section: Discussionmentioning

confidence: 99%